SpringBoot启动失败之application.yml缩进没写好
修改前：
spring前面空格了
报错输出：Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
修改后：
总结
YAML文件对缩进非常敏感，必须使用空格（通常为2个空格）来表示层次结构，不能使用Tab键。